Ferrite Chokes Block Common-Mode Currents

Commonly used on keyboard, mouse or video cables

Extremely useful for troubleshooting

Manufactures frequently have free evaluation kits

Best used on low-impedance cables

AC Line Cord Emissions

If AC line cord is suspected of emitting high-frequency harmonics,
insert an external line filter in series. If the emission level
(or measured common-mode current) drops, then improved line filtering
is required.

An external filter can be constructed with an extra power line
filter module and spare AC line cord.

Cut the cord down to minimal size and carefully solder the
stripped ends to the filter, observing the correct connections.
Wrap with electrical tape.

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